Granted Patent
Utility
US 4,785,175 · App. 07/045,205
Inspection of buried pipelines
Inventors:
Malcolm R. Wormald, Lionel G. Sanders, Colin G. Clayton
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: May 4, 1987
Inventors
Malcolm R. Wormald
Lionel G. Sanders
Colin G. Clayton
Assignee (at issue)
BRITISH GAS PLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.